IdentificationPurple-leaved willowherb is a 15-150 cm tall leafy, hairy perennial. Its lance-shaped leaves are stalkless or short-stalked, and may be finely toothed. They usually grow in opposite pairs along the stem, though they may begin to alternate at the top portion of the stem. Small pinky-purple to white flowers form clusters at the top of the stem. This plant grows from basal rosettes or bulblets.

Habitat & RangePurple-leaved willowherb grows in wet to moist open habitats at low to middle elevations. Look for it along streams and lakes, and in meadows and thickets. It quickly establishes itself in disturbed areas such as clearcuts and roadsides; while it is a native species it is considered a weed in nurseries and other horticultural ventures. It is found throughout much of North America as well as eastern Asia.